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Geomagnetic activity in April 1974
Mean Ap21.3No. 123 of 1138
G1+ days19
G3+ days0
Max Ap4818 Apr 1974
Daily Ap
Daily max Kp
| Date | Max Kp | Ap | Level |
|---|---|---|---|
| 2 Apr 1974 | 5o | 15 | G1 |
| 3 Apr 1974 | 6o | 39 | G2 |
| 4 Apr 1974 | 5+ | 35 | G1 |
| 5 Apr 1974 | 5- | 18 | G1 |
| 6 Apr 1974 | 6- | 26 | G2 |
| 7 Apr 1974 | 5o | 18 | G1 |
| 9 Apr 1974 | 5- | 16 | G1 |
| 10 Apr 1974 | 5o | 28 | G1 |
| 11 Apr 1974 | 5o | 19 | G1 |
| 18 Apr 1974 | 6+ | 48 | G2 |
| 19 Apr 1974 | 6+ | 39 | G2 |
| 20 Apr 1974 | 6- | 46 | G2 |
| 21 Apr 1974 | 6- | 35 | G2 |
| 22 Apr 1974 | 5- | 31 | G1 |
| 23 Apr 1974 | 5o | 29 | G1 |
| 24 Apr 1974 | 5- | 19 | G1 |
| 26 Apr 1974 | 5o | 21 | G1 |
| 27 Apr 1974 | 5- | 19 | G1 |
| 28 Apr 1974 | 5o | 23 | G1 |
Same month a year earlier
| Month | Mean Ap | G1+ | G3+ |
|---|---|---|---|
| April 1973 | 29.8 | 18 | 4 |
| April 1974 | 21.3 | 19 | 0 |
Dates and time slots are UTC. Kp is the 3-hourly planetary geomagnetic index (0–9); Ap is the daily average disturbance. G1–G5 follow the NOAA storm scale (Kp 5- and above counted as G1). Aurora visibility also depends on weather and location. The latest values are preliminary.
About this page
Mean Ap 21.3 in April 1974, No. 123 of 1138 months since 1932; 19 days reached G1 or higher.